They are working to preserve the delicately balanced ___of these wetlands.
A. biodiversity
B. ecosystem
C. environment
D. surrounding
Giải bởi Vietjack
biodiversity (n): sự đa dạng sinh học
ecosystem (n): hệ sinh thái
environment (n): môi trường
surrounding (n): vùng lân cận
=> They are working to preserve the delicately balanced ecosystem of these wetlands.
Tạm dịch: Họ đang làm việc để bảo tồn hệ cân bằng sinh thái của những vùng đất ngập nước này.
Đáp án: B
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